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Sorry for the inconvenience. Met vriendelijke groet / kind regards,=0A= =0A= Mike Looijmans=0A= System Expert=0A= =0A= =0A= TOPIC Embedded Systems B.V.=0A= Materiaalweg 4, 5681 RJ Best=0A= The Netherlands=0A= =0A= T: +31 (0) 499 33 69 79=0A= E: mike.looijmans@topic.nl=0A= W: www.topic.nl=0A= =0A= Please consider the environment before printing this e-mail=0A= On 02-11-2026 01:08, Jonathan Cameron wrote: >>> Complicated sounding solution. Can we claim buffered mode instead? >>> That would ensure the update_scan_mode and this don't race and mostly >>> would be taking an uncontended lock. >> I don't see how to do it where the race is. The sample is pushed from >> ads1298_rdata_complete(), the completion of that spi_async(), which the >> SPI core "invokes in a context which can't sleep". > Ah. I'd missed that complexity and was assuming this was a normal > threaded interrupt handler. One simplification here would be to stop usi= ng > async spi and instead just use synchronous spi in an interrupt thread whi= ch > is how most drivers handle similar flows. The async SPI is there for a reason - at least the hardware we had at=20 the time would drop samples with the threaded interrupt solution. The hardware wasn't really designed with an application CPU in mind, or=20 they would have added a small FIFO to reduce the interrupt rate.=C2=A0At it= s=20 nominal 500 Hz frequency the interrupt rate is already 1 kHz. --=20 Mike Looijmans System Expert TOPIC Embedded Products B.V. Materiaalweg 4, 5681 RJ Best The Netherlands T: +31 (0) 499 33 69 69 E:mike.looijmans@topic.nl W:www.topic.nl